乔利杰
断裂、环境断裂和电化学腐蚀的研究
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- 姓名:乔利杰
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- 担任导师情况:
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者
- 职称:-
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学科领域:
材料科学基础学科
- 研究兴趣:断裂、环境断裂和电化学腐蚀的研究
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345
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成果数
10
【期刊论文】Molecular dynamics simulation of microcrack healing in copper
乔利杰, S. Li a, K.W. Gao a, L.J. Qiao a, *, F.X. Zhou b, W.Y. Chu a
Computational Materials Science 20(2001)143-150,-0001,():
-1年11月30日
The molecular dynamics method is used to simulate microcrack healing during heating or/and under compressive stress. A center microcrack in Cu crystal could be sealed under a compressive stress or by heating. The role of compressive stress and heating in crack healing was additive. During microcrack healing, dislocation generation and motion occurred. If there were pre-existed dislocations around the microcrack, the critical temperature or compressive stress necessary for microcrack healing would decrease, and the higher the number of dislocations, the lower the critical temperature or compressive stress. The critical temperature necessary for microcrack healing depended upon the orientation of crack plane. For example, the critical temperature of the crack along (0 0 1) plane was the lowest, i.e., 770K.
Microcrack healing, Molecular dynamics simulation, Dislocation, Cu
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乔利杰, Y. Wang, W. Y. Chu, K. W. Gao, Y. J. Su, and L. J. Qiao a)
APPLIED PHYSICS LETTERS VOLUME 82, NUMBER 10, 10 MARCH 2003,-0001,():
-1年11月30日
In this letter, we report on delayed fracture of lead zirconate titanate ceramics with a Zr/Ti ratio of 52/48(PZT-5) ferroelectric ceramics in silicon oil under sustained electric field, and that in silicon oil or moist atmosphere under sustained mechanical load. The experimental results show that sustained electric fields may cause delayed fracture of PZT-5 ceramics and there is a threshold field for the delayed fracture. The threshold electric field is less than one third of the critical electric field to cause instant fracture and is also half of the coercive field of the PZT-5 ceramics.
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乔利杰, X.L. Kong a, ∗, Y.B. Liu b, L.J. Qiao a
Wear 256(2004)747-753,-0001,():
-1年11月30日
Powder compacting processwas employed to fabricate nanocrystalline Cu-Zn alloy layer on the surface of coarse-grained copper matrix. The tribological behaviors of nanocrystalline surface layer after annealing in air were investigated. Sliding wear tests were performed on a pin-on-disk test machine under dry conditions. The morphologies and element chemical states of the worn surfaces were examined with scanning electron microscopy (SEM) and X-ray photoelectron spectrometer (XPS), respectively. It was found that 300℃ annealed nanocrystalline surface layer presented optimum mechanical and tribological properties. The 300℃ annealed nanocrystalline surface layer showed remarkably high load-bearing capacity. A tribo-surface film almost covering entire worn surface was observed at applied load range from 60 to 160 N. This tribo-surface film was found to comprise elements from both the sliding counterparts. XPS analysis revealed the enrichment of nanocrystalline ZnO in the tribo-surface film, which can contribute to reduce friction coefficient and form a more steady and long life tribo-surface film.
Nanocrystalline Cu-Zn alloy, Surface layer, Wear resistance, Tribo-surface film
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【期刊论文】STM investigation on interaction between superstructure and grain boundary in graphite
乔利杰, Yang Gan *, Wuyang Chu, Lijie Qiao
Surface Science 539(2003)120-128,-0001,():
-1年11月30日
Interaction between superstructures and grain boundary in graphite has been investigated by STM. Through scanning for several times against the step of a terrace on the graphite substrate, a monolayer with a grain boundary can be torn apart from the terrace and rotated by a known angle 56.4
Graphite, Scanning tunneling microscopy, Superlattices, Grain boundaries
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【期刊论文】In situ AFM observation of crack propagation in CuNiAl shape memory alloy
乔利杰, Y.H. Lu*, S. Liang, W.Y. Chu, L.J. Qiao
Intermetallics 10(2002)823-827,-0001,():
-1年11月30日
The nucleation and propagation behaviors of cracks in CuNiAl shape memory alloy were observed using in situ technique under atom force microscope (AFM). The results indicated that,in CuNiAl shape memory alloy,the martensitic transformation first occurred at crack tip upon loading,and then the microcrack nucleated and propagated along martensite interface. The slip bands appeared only after considerable crack propagation. After that,the crack usually propagated alternately along martensite interface or slip bands.
B., Martensitic transformations
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【期刊论文】THERMODYNAMIC ANALYSIS ON THE ROLE OF HYDROGEN IN ANODIC STRESS CORROSION CRACKING
乔利杰, L.J. QIAO and X. MAO
Acta metall, mater. Vol. 43. No.11, pp. 4001-4006. 1995,-0001,():
-1年11月30日
A synergistic effect of hydrogen and stress on a corrosion rate was analyzed with thermodynamics. The results showed that an interaction of stress and hydrogen could increase the corrosion rate remarkably. Stress corrosion cracking (SCC) of austenitic stainless steel (ASS) was investigated in boiling chloride solution to confirm the analysis. Hydrogen could be introduced into the specimen and concentrated at the crack tip during SCC in boiling LiCI solution (143 C). The concentrating factor is about 3 which is consistent with calculated results according to stress induced diffusion.
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【期刊论文】ON THE NANOCRACK NUCLEATION AND PROPAGATION MECHANISMS OF Fe3A1 INTERMETALLICS
乔利杰, X. MAO and L.J. QIAO
Acta mater. Vol. 44, No.6, pp. 2327-2335, 1996,-0001,():
-1年11月30日
The initiation and propagation of nanometre scale cracks have been investigated in detail in in situ TEM observations for the intermetallic compound Fe3AI under Mode I loading. When cracks propagate directly from the thin edge of a double-jet hole, no dislocation is deteced and no dislocation emission is found. In thicker regions of the foils, thinning takes place because a great number of dislocations are emitted from the crack tip, and then an electron semi-transparent region is formed in front of the crack tip. A superdislocation model is used and it indicates that the maximum normal stress occurs in the crack tip region but not at the crack tip. Nanometre scale cracks are initiated discontinuously ahead of the main crack tip in the highly stressed zone. The size of the smallest observed was about 3 nm. The radius of the main crack tip was about 2.5 nm. Distances between discontinuous nanocracks and the main crack tip were 5-60 nm which depends on the applied tensile loading. The distance increases with the tensile loading, which is consistent with an "elastic-plastic" theoretical model that maximum normal stress location has the relation dαK21, where KI is the applied stress intensity factor. Hydrogen charging effects on the cracking behaviour are studied. In contrast to the non-charged case, the crack propagates preferably from the main crack tip. The propagation rate is higher and the crack radius is smaller.
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乔利杰, L.J. Qiao a, *, W.Y. Chu a, J.L. Luo b
Materials Science and Engineering A276(2000)141-146,-0001,():
-1年11月30日
Combining hydrogen enrichment, segregation to grain boundaries and their effects on surface and plastic energies, a model was developed to predict threshold stress intensity factor for hydrogen induced intergranular cracking. For a tubular steel, the calculated KIH:KIC is 0.34 while the experimentally determined value is 0.32, which is fairly consistent with the theoretical value.
Tubular steel, Hydrogen induced cracking, Intergranular fracture
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乔利杰, Y.W. Wang, W.Y. Chu, J.X. Li, X.D. Hui, Y.B. Wang, K.W. Gao, Y.J. Su, L.J. Qiao*
Materials Letters 58(2004)2393-2396,-0001,():
-1年11月30日
The effect of hydrogen on the formation and growth of shear bands in Zr-based bulk metallic glass during dynamic charging under sustained load has been investigated using a constant-load device. In situ observation in optical microscopy showed that the shear bands generated during loading became wider and longer gradually, and the new shear bands formed and grew continuously during charging under sustained load.
Bulk metallic glass, Hydrogen, Shear band
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乔利杰, Y.J. Su, Y. Wang, W.Y. Chu, K.W. Gao, L.J. Qiao *
Acta Materialia xxx(2004)xxx-xxx,-0001,():
-1年11月30日
The combined effect of electric and mechanical loading on fracture of the PZT-5 ferroelectric ceramics in silicon oil has been investigated using single-edge notched specimens. The results show that the fracture toughness and the threshold stress intensity factor of delayed fracture in silicon oil, i.e., stress corrosion cracking, decreases linearly with increasing the applied electric field, either positive or negative. For the PZT-5 ferroelectric ceramics, delayed fracture in silicon oil under sustained positive or negative field can occur, and the threshold field for delayed fracture under sustained positive or negative field decreases linearly with applied stress intensity factor. The combined effect of electric and mechanical loading on delayed fracture in silicon oil includes field-enhancing delayed fracture under sustained load and stress-enhancing delayed fracture in silicon oil under sustained field.
PZT-5 ferroelectric ceramics, Fracture toughness, Delayed fracture under sustained load, Delayed fracture under sustained electric field
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